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  • The Rhizobiaceae are a family of proteobacteria, including many species of rhizobia, as well as plant parasites such as Agrobacterium. The Rhizobiaceae are, like all Proteobacteria, Gram-negative. They are aerobic and the cells are usually rod-shaped. Many species of the Rhizobiaceae are diazotrophs, they are able to fix nitrogen and are symbiotic with plant roots.

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